Rifle upper



FIG. 1 is a side view of a rifle upper;

FIG. 2 is an enlarged view of the side view of the rifle upper; and,

FIG. 3 is a perspective side view of the enlarged view of the rifle upper.

Any broken line disclosures shown in the Figures of the rifle upper are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a rifle upper, as shown and described. 